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Unix And Shell Scripting

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Understanding Unix And Shell Scripting.

Understanding Unix And Shell Scripting.

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  • Hi Malik,



    Presetation was very good, Shall I get a copy of above presentation if possible?

    my mail id is 'srinig20@gmail.com'



    Regards,

    Srini
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  • Good Presentation! it's useful one for beginners of unix & shell
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  • Unix And Shell Scripting
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  • best one
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    Unix And Shell Scripting Unix And Shell Scripting Presentation Transcript

    • Unix & Shell Scripting Presenter: Jaibeer Malik August 6, 2004
    • Agenda
      • Objectives
      • UNIX
      • Shell Scripting
      • Questions
      • Feedback
    • Session Objectives
      • Understand the basics of Unix Operating Environment
      • Understand the basics of Shell Scripting
    • Unix History
      • History of the Unix Operating System:
      • - Beginning at AT&T Bell Laboratories
      • - Kenneth Thompson
      • - Dennis Ritchie
      • - Berkeley: The Second School
      • - BSD UNIX
      • - Stallman and Torvalds
      • - GNU and LINUX
    • Unix Why???
      • There are only two kind of people
      • who understand 0 1 and who don’t understand
      • 01010101010101010101010101010101010101010101010101010
      • The features that made UNIX a hit from the start are:
        • Multitasking capability
        • Multi-user capability
        • Portability
        • UNIX programs
        • Library of application software
    • ARCHITECTURE
    • ARCHITECHTURE
      • The UNIX system is functionally organized at three levels:
        • The kernel, which schedules tasks and manages storage;
        • The shell, which connects and interprets users' commands, calls programs from memory, and executes them; and
        • The tools and applications that offer additional functionality to the operating system
    • Solaris File System Tree
    •  
    • Navigating The File System
      • pwd: Checking your Current Directory
      • cd: Changing Directory
      • mkdir: Making Directories
      • rmdir: Removing Directories
      • ls: Listing Files
    • General-Purpose Utilities
      • banner: Display a Blown-up Message
      • cal: The Calendar
      • date: Display the System Date
      • who: Login Details
      • tty: Knowing Your Terminal
      • man <command>: Displays help on <command>
      • apropos <keyword>:locates commands by keyword lookup
      • whatis <command>: Brief command description
    •  
    • Handling Files
      • cat: Displaying and Creating Files
      • cp: Copying a File
      • rm: Deleting Files
      • mv: Renaming Files
      • more: Paging Output
      • lp: Printing a File
      • file: Know the file types
      • wc: Line and Word and character counting
      • split: Splitting a File into Multiple Files
      • cmp: Comparing two files
    • File Attributes
      • ls –l: listing File Attributes
      • ls –d: Listing Directory Attributes
      • stat: Display File Permissions
      • chmod: Changing File Permissions
      • chown: Changing Ownership
      • chgrp: Changing Group
      • chsh: Changing Shell
      • ln: Links
      • umask: Define Defaults File Permissions for a User
    • The Environment
      • env: Displays Environment Properties
      • .profile: The Script Executed During Login Time
      • PWD: Know your Current Directory
      • HISTSIZE: Define History Size
      • LOGNAME: Login Name
      • SHELL: Your Default Shell
      • HOME: Define Home Directory
      • PATH: Declare Path
      • MAIL: Declare Mail Directory Path
      • alias: Define short-hand names for commands
    • The Process
      • ps: Process Status
      • <command> &: To run a process in Background
      • bg: To run a process in Background
      • fg: To run a process in Foreground
      • kill: Premature Termination of a Process
      • nice: job execution with low Priority
      • at and batch: Execute Later
      • cron: Running jobs Periodically
    • Communication And Electronic Mail
      • write: Two-way Communication
      • mesg: Your Willingness to Talk
      • talk: Splits the screen into two windows for chatting
      • mail: The mailer
      • news: To read news messages
      • elm: A screen-oriented mail handler
      • pine: Another mail program
      • finger: Details of Users
    • Networking
      • telnet: Remote Login
      • ftp: File Transfer (protocol)
      • rlogin: Remote Login Without Password
      • rcp: Remote File Copying
    • System Administration
      • useradd: Adding Users
      • /etc/passwd: User Information
      • /etc/shadow: Encrypted Passwords
      • userdel: Removing Users
      • fsck: File System Checking
      • df: Checking disk size
      • du: Checking file size
      • groupadd: Adding Group
      • groupdel: Deleting Group
      • groupmod: Modifying Group
    • The Shell
      • The following table shows the default system prompt and superuser prompt for the C shell, Bourne shell, and Korn shell.
    • Shell Scripting
      • A universal convention is that the extension .sh be used for shell scripts (or shell programs or shell procedures ).
      • The scripts can be executed in two ways:
      • $ chmod +x <filename.sh>
      • $ sh <filename.sh>
      • read: For taking input from the user
      • Example: $ cat example1.sh
      • #First Simple Example to print the standard input from the user to the standard output.
      • echo “Enter Your Name: “
      • read name
      • echo “Your name is: $name”
    • Shell Scripting (Contd..)
      • When arguments are specified with a shell procedure, they are assigned to certain special “variables” or rather positional parameters.
      • $1,$2,etc. The positional Parameters
      • $* Complete set of positional parameters as a single string
      • $# Number of arguments specified in command line
      • $0 Name of executed command
      • $? Exit status of the last command
      • $! PID of last command
    • Shell Scripting (Contd..)
      • Example: $ cat example2.sh
      • #Example to print the standard input from the user to the standard output using positional parameters.
      • echo “Program: $0
      • The Number of Arguments Specified is $#
      • The Arguments are $*”
      • echo “Your Name: $1 Your Extension Number: $2”
      • Example: $ example2.sh Jai 5630
      • Program: example2.sh
      • The Number of Arguments Specified is 2
      • The Arguments are Jai 5630
      • Your Name: Jai
      • Your Extension Number: 5630
    • Shell Programming (Contd..)
      • The && operator delimits two commands; the second command is executed only when the first succeeds.
      • The || operator delimits two commands; the second command is executed only when the first fails.
      • The exit statement is used to prematurely terminate a program.
      • The if Conditional
      • if condition is true
      • then
      • execute commands
      • else
      • execute commands
      • fi
    • Shell Scripting (Contd..)
      • Relational Operators
      • -eq Equal to
      • -neq Not equal to
      • -gt greater than
      • -ge greater than or equal to
      • -lt less than
      • -le less than or equal to
      • test uses certain operators to evaluate the condition on its right, and returns either a true or false
      • test $x –eq $y or [$x –eq $y]
      • String tests used by test
      • -n stg true if string stg is not a null string
      • -z stg true is string stg is a null string
      • s1 = s2 true if string s1=s2
      • s1! = s2 true if string s1 is not equal to s2
      • stg true if string stg is assigned and not null
    • Shell Scripting (Contd..)
      • File-related tests with test
      • -e file true if file exists
      • -f file true if file exists and is a regular file
      • -r file true if file exists and is a redable
      • -w file true if file exists and is a writable
      • -x file true if file exists and is a executable
      • -d file true if file exists and is a directory
      • -s file true if file exists and has a size greater than zero
    • Shell Scripting (Contd..)
      • The case conditional
      • case expression in
      • pattern1) execute commands;;
      • pattern2) execute commands;;
      • pattern3) execute commands;;
      • ……
      • esac
      • The while loop
      • while condition is true
      • do
      • execute commands
      • done
    • Shell Scripting (Contd..)
      • The for loop
      • for variable in list
      • do
      • execute commands
      • done
      • Example:
      • $ for x in 1 2 4 5 #list has 4 strings
      • do
      • echo “ The value of x is $x”
      • done
      • The value of x is 1
      • The value of x is 2
      • The value of x is 4
      • The value of x is 5
    • Shell Scripting (Contd..)
      • The here document symbol (<<) is used sometimes when we need to place the data inside the script.
      • The here document symbol (<<) is followed by the data and a delimiter.
      • shift transfers the contents of a positional parameter to its immediate lower numbered one.
      • When set –x is used inside a script, it echoes each statement on the terminal, preceded by a + as it is executed.
    • Example
      • bash-2.03$ cat example3.sh
      • IFS=&quot;|&quot;
      • while echo &quot;Enter Department Code: &quot;
      • do read dcode
      • set -- `grep $dcode data`
      • case $# in
      • 3) echo &quot;Department name : $2 Emp-id of head of dept : $3&quot;
      • shift 3 ;;
      • *) echo &quot;Invalid Code&quot; ; continue
      • esac
      • done
      • bash-2.03$ cat data
      • 01|accounts|6213
      • 02|admin|5423
      • 03|marketing|6521
      • 04|personnel|2365
      • 05|production|9876
      • 06|sales|1006
    • Example (Contd…)
      • bash-2.03$ bash example4.sh
      • Enter Department Code: 99
      • Invalid Code
      • Enter Department Code: 01
      • Department name : accounts Emp-id of head of dept : 6213
      • Enter Department Code: 06
      • Department name : sales Emp-id of head of dept : 1006 Enter Department Code:
    • Questions
      • ?
    • ... Feedback…